| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a laminated varistor which has excellent insulation resistance, voltage nonlinearity, etc. and which hardly brings about the deterioration of the characteristics after a high temperature load test, by reducing the characteristic variations between the varistors even if reducing the size and the height. <P>SOLUTION: The method for manufacturing the laminated varistor includes the steps of preparing a laminate in which a plurality of internal electrodes are laminated via an unburned ceramic layer containing a composition containing a ZnO as a main component, and an outer ceramic layer made of ceramics containing the same composition as the ceramic layer is provided at the laminating direction outside the internal electrode laminated part; baking the laminate to obtain a sintered material; and forming the internal electrode on the outer surface of the sintered material. The baking step is performed in a baking profile having at least a temperature raising step, a high temperature holding step, and a temperature lowering step. The oxygen concentration in an atmosphere in the high temperature holding step is set to 15 vol% or more. The oxygen concentration in at least the partial temperature range of the temperature range from the temperature lowering starting temperature of the temperature lowering step to 600°C is set to 1 to 15 vol%. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
